At temperatures between 80–120°C (176-248°F), the iron sulfide catalyzed reactions in which molecular hydrogen reduced carbon dioxide, which would have been abundant before life began. High ...

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[4Fe-4S] clusters in association with other Fe centers (such as siroheme in sulfite reductase and dinuclear nonheme iron in hydrogenase); and (iii) heteronuclear [Fe-S] complexes with Mo ...

Sulfur, in the form of iron sulfide, can cause steel to be too porous and prone to cracking. Atomic number 16, atomic weight 32.064. Silicon (Si): Silicon is the second most abundant element in ...